[gnome-panel] libgnome-panel: avoid possible null pointer dereference

[Alberts Muktupāvels <muktupavels src gnome org>]

commit ae9e7210da5d90f40aafbc7e142837c6f0ffdcb3
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Mar 7 20:39:04 2020 +0200

    libgnome-panel: avoid possible null pointer dereference

 libgnome-panel/gp-applet.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/libgnome-panel/gp-applet.c b/libgnome-panel/gp-applet.c
index f5f6347ca..d67b7197b 100644
--- a/libgnome-panel/gp-applet.c
+++ b/libgnome-panel/gp-applet.c
@@ -300,7 +300,10 @@ size_hints_changed (GpAppletPrivate *priv,
 {
   guint i;
 
-  if ((!priv->size_hints && size_hints) || (priv->size_hints && !size_hints))
+  if (priv->size_hints == NULL && size_hints == NULL)
+    return FALSE;
+
+  if (priv->size_hints == NULL || size_hints == NULL)
     return TRUE;
 
   if (priv->size_hints->n_elements != n_elements)